Modified superstructure fiber Bragg grating for a filter application

Abstract

Performance of a modified superstructure fiber Bragg grating is carried out by; simulation using a Matlab and then by optisystem7. Results for these two simulations are compared with an experimental investigation for three special FBGs in addition to a standard one. These four FBGs have one, two, three, and four regions. For each region, Bragg wavelength is increased around 6nm, with constant spacing between every two regions. Laser reflectance (R) and transmittance (T) spectra and their corresponding number of peaks and their bandwidths are observed and analyzed in a constant temperature and strain. Results for this investigation indicate enhancement for the modified FBG to be an effective filter that can be employed for communication as well as sense. Filtering the transmitted signals could be satisfied in a simple and more efficiency than the traditional device.

Effect of GeO2 Dopants in FBG Sensor Performance for Temperature and Strain

“…In the case of measuring power instead of wavelength, the results for NUFBG response indicate variant Gauss functions depending on active sensor wavelength, shown in Figure (6). In comparison to last section results, in which the response obeys varied functions.…”

“…In which the frequency shift is easy to observe versus the changed parameter in comparisons with multi regions FBG that experimentally investigated by Ref. [6]. CONCLUSIONS Constructing FBG combination improves the sensing properties for the FBG sensor.…”

“…In this section, insertion of a signal of 1550 nm wavelength into the input of NUFBG has been carried out where the FBG has specific active lengths; 10, 20, and 30mm and a constant effective refractive index of 1.45 with variable applied temperature. Results observed from the deflection side give different responses, as shown in Figure (5) and its entire subfigures A, B, C and D based on equation (6). As shown in part (A), the FBG active length was 10mm from T=20.1264 o C to T=59.9646844 o C, but the wavelength ranged from 1.54989965 nm to 1.54996984 nm, as shown in part (A).…”

“…Furthermore, the FBG sensor itself has recently been continuously enriched by research due to its applications in optical communications [5], such as smart frequency filtering [5], [6], [7], dynamical encrypting with chaotic communications [8], [9], [10], [11].…”

Characterization Study of Double Filtered Sensor Length Effect on Strain Sensitivity

“…Sensitivity for grating region protection, pre-tensioning, the adhesive of the sensor, and the choice of length of the sensor are based on experimental work presented by Ref. [22]. Concerns examined before and during the experimentation structure of an FBG sensor.…”